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hnori22003

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[tex]3x = y + 7[/tex]

[tex]y = 3x - 7[/tex]

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[tex]3x + y + 7 = 78[/tex]

[tex]3x + (3x - 7) + 7 = 78[/tex]

[tex]3x + 3x - 7 + 7 = 78[/tex]

[tex]6x = 78[/tex]

Divide sides by 6

[tex] \frac{6}{6} x = \frac{78}{6} \\ [/tex]

[tex]x = 13[/tex]

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katherineyang2006

Answer:

13

Step-by-step explanation:

180-102=78(for 2 sides)

1side=78/2=39

3x=39

x=13

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